Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f87dd82e6c84
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug 986206 - Report filenames on test failures

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https://hg.mozilla.org/integration/gaia-central/rev/ddf7f6d01f8a
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #17304 from mcav/timerrest

Bug 982789 - [B2G][Clock]Set Timer intermittently starts countdown at incorrect starting point. r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/ba7e8f7bec31
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 982789 - [B2G][Clock]Set Timer intermittently starts countdown at incorrect starting point
Bumping manifests a=b2g-bump